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Slowing DDR3 clock for i.MX6Q

Question asked by frankmiller on Jul 19, 2013
Latest reply on Sep 5, 2018 by Peter Amond

Greetings,

 

We're having some trouble with a custom i.MX6Q board (based on sabreSD reference).  It appears that our DDR3 is close to timing margins.  I'd like to slow the DDR3 clock rate down to 396MHz.  I tried plugging that value into the DDR3 programming spreadsheet and replacing the values in flash_header.S with the updated spreadsheet values.  However, when u-boot comes up, its still showing 528MHz for the ddr clock.  I also noticed that mx6q pll2 is set to 528MHz.  Is there something else I need to do, like change pll2 somehow?

 

Thanks,

FM

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